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広島県沿岸地域の潮位変化の特徴 Characteristics of the sea level variations in the coastal region of Hiroshima prefecture 向井, 厚志 ムカイ, アツシ MUKAI, Atsushi 潮位変化 瀬戸内海 海洋潮汐 黒潮 副振動 sea level variations Seto Inland Sea oceanic tide Kuroshio Current secondary undulation application/pdf 広島県沿岸部で観測された潮位変化を用いて，その周波数特性や長周期変化の特徴を調べた．海洋潮汐の振幅は瀬戸内海東側ほど大きくなるが，気圧応答係数には地域差はみられなかった．潮汐位相は瀬戸内海東側ほど遅れを示しており，豊後水道を通した瀬戸内海内部への海水移動に要する時間を反映していると考えられる．潮位変化には，黒潮流軸までの距離の変化に応じた長周期変化がみられ，その変化量は，瀬戸内海東側ほど大きくなっている．福山港の潮位変化のスペクトルには0.7cph（cycle per hour）付近にピークが現れており，これは福山港入江内で励起された副振動を表していると考えられる． I investigated the characteristics of frequency dependence and long-term changes of the sea level variations observed at the coastal region of Hiroshima prefecture. The ocean tidal amplitude increases to the eastern region of the Seto Inland Sea, while the pressure response coefficients show little regional deviations. The tidal phase shows a larger delay in the eastern region of the Seto Inland Sea. It is considered that this delay is caused by the oceanic water migration through the Bungo Channel into the Seto Inland Sea. The long-term variations of sea level are dependent on the distance to the Kuroshio Current axis. The amount of the variations increases to the eastern region of the Seto Inland Sea. The sea level changes at Fukuyama has a spectral peak around 0.7 cph (cycle per hour), which is considered to show the secondary undulation excited in the inlet of Fukuyama Port. 福山市立大学都市経営学部 2022-03-07 jpn departmental bulletin paper VoR https://doi.org/10.15096/UrbanManagement.1412 https://fcu.repo.nii.ac.jp/records/244 10.15096/UrbanManagement.1412 https://doi.org/10.15096/UrbanManagement.1412 AA12564315 2186-862X 都市経営 : 福山市立大学都市経営学部紀要 Urban Management : Bulletin of the Faculty of Urban Management, Fukuyama City University 14 165 174 https://fcu.repo.nii.ac.jp/record/244/files/toshi14_12mukai.pdf application/pdf 2.1 MB 2023-06-20